Addicts actively reject housing with rules and seek out abandoned buildings. The idea is to provide them with safe refuge where they do not have to be compliant except to be nonviolent, while keeping them in immediate proximity to a rehab on-ramp that would move them out of that situation into inpatient rehab.
They already move out of housing to seek out abandoned buildings because their choices are incompatible with society at large.
My idea is an attempt to align incentives for a better outcome.